Now the template backend has a node, which can represent an adress with an offset.

It has been empty for nearly all systems. People who used to put stuff
in config.h can still create a config.h on their own and inject
-include (gcc) or /FI (msvc) into their CPPFLAGS.

Just state the copyright and the project the files belong to. You can
then find the COPYING file for the whole project.

This was an odd convention from the past, there's no need for it
anymore.

This tries to get the names in a consistent format. We basically have 2
views on register allocation/constraints now:

1) Register Requirements and Assigments are per-instruction. Each
   instruction has requirements on its inputs and outputs, register get
   assigned for outputs of an instruction (assignment is an attribute of
   an instruction, not of the Proj-nodes).
   The internal datastructures model this form!

   The functions here have the form:
     arch_get_irn_register_req_in(node, input_nr)
     arch_get_irn_register_in(node, input_nr)
     arch_get_irn_register_req_out(node, output_nr)
     arch_set_irn_register_out(node, output_nr, register)

2) Register Requirements and Assignments are on firm-values. This view
   allows to query/assign requirements and registers at the Proj nodes
   instead of the repsective predecessors.
   This is a convenience interface modeled on top of the other!

   The functions have the form:
     arch_get_irn_register_req(node)
     arch_get_irn_register(node)
     arch_set_irn_register(node, register)

[r28062]

[r27995]

[r27836]

[r27653]

[r27460]

[r27277]

  (with different arguments and register constraints for the same node now)
- Lots of cleanups/changes in the arm backend. We can represent all
  "shifter operands" now (but the code selection isn't optimal yet)
- More fixes all over the place - arm backend handles 164.gzip now

[r26673]

- Introduced be_Start which is now used instead of iro_Start+be_RegParams
- further cleanups and fixes along the way

[r26549]

- Add a generic requirements+register+flag dumper to bearch; This avoids all
  backends/benode having their own slightly different dumpers
- Lots of cleanups in the backends along the way

[r26542]

- make phi nodes use backend_info instead of phi_handler hashmaps

[r26332]

[r26317]

[r26222]

[r25164]

[r25129]

	Node flags and node registers are stored in a generic backend_info struct now
	instead of every part of the backend doing custom (and slow) stuff

[r23142]

[r22754]

Rename arch_register_req_type_should_be_different to the more appropriate arch_register_req_type_must_be_different.

[r21302]

[r17143]

- Remove !in and arch_register_req_type_should_be_different_from_all.
- Specify the output constraints of ia32 ShlD and ShrD more accurately as in_r1 !in_r2 !in_r3 instead of !in. This usually saves the fourth register.

[r16320]

- extend backend generator to support custom irop data
- cleanup and streamline transform code in ia32
- Improve handling of AddAM vs. Add used in AM expressions

[r16254]

Allow two should-be-same constraints for every out register. This is useful for commutative nodes on two address code machines (i.e. x86).

[r15953]

[r14757]

[r14658]